This is not unique to porkhash, many if not majority of proposals either
directly or indirectly rely on source or some central server being
reachable for confirmation (all certificate based proposals, my callback
verification proposals, RMX - have to have working dns server, etc.)
But to be more exactly on porkhash, you do not need to have your end to
have persistent connection, what you need is to have verification server
available somwhere and it be contracted by the source (server does not have
to be same machine or even same ip network as source - can be futher
upstream). For destination, you do checking on email when you're
receiving it, so once ETRN is then time when destination has connection
to internet and can verify email.
This is also a problem with porkhash: it disenfranchises those without
persistent connections (eg much of the third world). There's still a
heck of a lot of mail tunneled over UUCP these days, or which relies on
disconnected ETRN semantics.
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